I have been running that case in the 489 style, 4.30 gears, and 35 spline set up for 3 or 4 years. Ring and pinion life sucks for me at about 80 passes.

My Dart is about 3300lbs, normally 1.38-1.42 60' times

A 9" is going under the car soon. Save your money Dom [/quote]

Have you ever tried a 4.10 gear?
[/quote

Yes, but it has been a while. They seemed to last a little better, but I can't put a number on it (combo was a little different). Car is quicker and more consistent with 4.30s.

I pull them before they blow up (usually), they start talking on the return road. I will pull them and find cracked teeth. Yukon, Richmond, US gear have all failed, shock proof gear lube seams to help some. I am done feeding it.